1 edition of Laboratory evaluation of cover materials to reduce acid generation in reactive tailings found in the catalog.
Laboratory evaluation of cover materials to reduce acid generation in reactive tailings
Written in English
The development of design criteria for covers that would minimize acid generation in reactive tailings were examined. Laboratory research examined physical contrasts to maximize resistance to oxygen diffusion, and validate diffusion models.
|The Physical Object|
|Pagination||18 p. :|
|Number of Pages||18|
Mitigating the generation of acid mine drainage from copper sulphide tailings impoundments in perpetuity: A case study for an integrated management strategy. Minerals Engineering, 23 (), p. Hofton, T. and R. Schwenger. Geomembrance Cover on Normetal Reactive Tailings – A Case Study. sufficient to prevent ongoing acid generation in the high sulphur layer. After the sulphide is depleted in the cover layer of T1F material, the oxygen consumption in the top layer will effectiveness of the low-sulphur neutral tailings cover layer.
At some orphaned and abandoned mine sites, acid mine drainage can represent a complex challenge due to the advanced tailings’ oxidation state as well as the combination of other factors. At the field scale, several parameters control sulfides’ oxidation rates and, therefore, the acidity generation. The objective of this paper is to map the acidity and geochemical . Long-term evaluation of coal ﬂy ash and mine tailings co-placement: A site-speciﬁc study Muluken B. Yeheyis*, Julie Q. Shang, Ernest K. Yanful Department of Civil and Environmental Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9.
The monolayer cover combined with an elevated water table (EWT) concept is an emerging method that appears to be particularly promising in the field of reclamation of sulfidic tailings ponds which may generate acid mine drainage (AMD). The principle of this technical approach relies on the fairly high matric potential of tailings. Tailings impoundments are grouped in three clusters according to their ARD generation potential. Thus cluster C1 includes the tailings of Cutii and Sartas impoundments not complying with inert waste criteria. Clusters C2 and C3 group tailings of lower contamination risk for water and classified as uncertain or low ARD generation potential.
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Acid generation can be reduced by applying a fine-grained, nonreactive cover layer to the tailings surface. The key process involves moisture retention by capillary forces so that near-saturated conditions can be maintained even when the cover layer occurs at several metres above the water by: Covers with capillary barrier effects (CCBE) are considered to be one of the most effective ways to control acid mine drainage (AMD) production from mine wastes.
The use of low-sulphide tailings in CCBE has been proposed recently for cases where other types of material may be unavailable near the mining site.
This paper presents leaching column test results Cited by: Low-sulphide tailings can serve as a moisture-retaining material to limit oxygen diffusion, and their residual sulphides can consume the diffusive oxygen that still gets through the cover.
A laboratory experiment using instrumented columns was initiated to confirm the efficiency of a low-sulphide tailings monolayer cover placed over acid Cited by: Yanful, E.
and Payant, S. C.:Laboratory evaluation of the performance of engineered soil covers for decommissioning of sulphidic tailings. Proceedings of the 44th Canadian Geotechnical Conference, 29 Sept–2 Oct.
Calgary, Alberta, by: study on the Evaluation of Alternate Dry Covers for the Inhibition of Acid Mine Drainage from Tailings represents part of the ongoing acid mine drainage (AMD) research effort.
In this study, the direction of further dry covers research was addressed. The theoretical basis of the concept of dry covers was reviewed. Potential dry cover materials. A permeable reactive barrier, designed to remove metals and generate alkalinity by promoting sulfate reduction and metal sulfide precipitation, was installed in August into an aquifer containing effluent from mine tailings.
Passage of groundwater through the barrier results in striking improvement in water quality. Dramatic changes in concentrations of SO4 (decrease of. A laboratory experiment using instrumented columns was initiated to confirm the efficiency of a low-sulphide tailings monolayer cover placed over acid-generating tailings to reduce.
The efficiency of non-acid generating tailings, desulfurized tailings, and non-reactive waste rocks as cover materials was demonstrated in previous laboratory and field studies. Cover thickness influences the concentration gradient from ambient air (% O 2 or about mol/m 3 or kg/m 3) at the surface to a very small value (close to 0) at the base of the cover (due to a rapid consumption by the sulphidic minerals in the reactive tailings); hence, increasing cover thickness tends to reduce oxygen diffusion rate.
Yanful EK, Simms PH, Payant SC. Soil covers for controlling acid generation in mine tailings: a laboratory evaluation of the physics and geochemistry. Water, Air, and Soil Pollution ((3–4)): a Crossref, ISI, Google Scholar. Two criteria were defined to evaluate the tailings cover system’s performance in preventing the generation of AMD.
First, as determined by laboratory column test results (Pabst et al. a, ; Bussière et al. ), the water table must be located at (or close to) the interface of the Goldex and the Manitou criterion is particularly challenging as the usual target for.
Soil covers for controlling acid generation in mine tailings: A laboratory evaluation of the physics and geochemistry. Water, Air, and Soil Pollution, (3–4), – CrossRef Google Scholar. To evaluate the effectiveness of soil covers, column experiments were conducted on tailings protected by a three-layer soil cover and tailings directly exposed in the open laboratory for a.
The laboratory observations suggest that while implementing a water cover over pre-oxidized tailings does substantially reduce metal release, long-term treatment of pond effluent and seepage may.
Covers with capillary barrier effects (CCBE) are multilayered oxygen barrier covers used in humid climates to reclaim reactive mine tailings and limit the generation of acid mine drainage. A laboratory study and numerical predictions were conducted to evaluate the effectiveness of a cover with capillary barrier effects (CCBE) made of mining materials in limiting the generation of acid mine drainage.
The present study included the installation of three experimental laboratory columns as physical models of CCBEs. Each column was instrumented to monitor the. Reactive tailings and cover material samples were collected in situ and characterised in the laboratory.
Large-size columns ( cm in height) were set up to evaluate the hydrogeological and geochemical response of the tailings and cover systems.
Monthly wetting and drying cycles were repeated over nearly 2 years to simulate climatic conditions. Acid generation can be reduced by applying a fine-grained, nonreactive cover layer to the tailings surface.
The key process involves moisture retention by capillary forces so that near-saturated conditions can be maintained even when the cover layer occurs at several metres above the water table. Textured layering of fine over coarse materials.
The net acid generation (NAG) test is a static test developed to predict the generation of acid rock drainage (ARD) during and after the mining operation.
It is suitable to use as a stand-alone prediction tool (Miller et al. ) and as a supplement to other static tests such as the acid-base accounting (ABA) test (Räisänen et al.
effect of vegetation on acid generation has not yet been realized. Even though each sulphide tailings area has its own unique method of approach, seed mixture, fertilizer analysis, planting schedule, etc., there are a number of components, technical questions, problems and solutions that are common to all.
Evaluation of the Use of Covers for Reducing Acid Generation from Strathcona Tailings: Executive Summary: pdf: a: Heath Steele Waste Rock Study, Phases I to III: Executive Summary: pdf: b: Engineering Design and Construction Phase IV – Composite Soil Cover Acid Waste Rock Study Heath Steele Mines: Executive Summary: pdf: bb.
With integrated tailings management, expenses would be incurred by Doyon mine to install a flotation circuit; however the rehabilitation costs would be reduced significantly by the use of desulphurized tailings as cover material.
Non-acid generating tailings impoundments rehabilitation costs are in the order of 10 CAD$/hectare, whereas acid.Field Evaluation of the Effectiveness of Engineered Soil Covers for Reactive Tailings: Volume 1- Laboratory and Field Tests & Volume 2 - University Contracts, October *** Review of Soil Cover Technologies for Acid Mine Drainage - A Peer Review of the Waite Amulet and Heath Steele Soil Covers, July